Method of producing an ornamental surface on granite



7 Dec. 2, 1930. E. A/CHASE 1,783,323

METHOD OF PRODUCING AN ORNAMENTAL- SURFACE ON GRANITE Filed Sept. 17', 1928 4?, mach-n.

, Patented "Dec. 2,1930

a smooth fiat surface of a pleasing texture.

EnRoY A. CHASE, 0F 1\TORTI-IFIELD, VERMONT, .nssreivoit 'ro, noon on A Esf 'OR oRAQQ Tron, or BURLINGTON, VERMONT, A CORPORATION or" VERMONT METHOD or PRODUCING AN Ca e t seamcatammm;

Ap plication filed September 17;" 92ajs aa1 u aoasa'z.

This invention relates to amethod offpro- I ducing an ornamental surface on gran te or other similar material. I

It is the object of the invention toproduce a novel surface effect on a block of granite or to produce a contrasting surface elfect around the elements of an ornamental surface design therein, or around the letters or figures of an inscription.

The particular steps of the improved methodby which I produce such an ornamental surface will be hereinafter described and more-particularly pointed out in the appended claims. I I a i a Two applications of the invention are shown in the drawings which illustrate the successive steps in applying my improved method.

v Fig. 1 is a partial plan view of a piece of granite having its surface smoothed preferably by a grinding operation;

Fig. 2 1s asimilar view, showing a screen applied thereto Fig. 3 is a plan View of the finished prod uct;

Fig. 4: partial plan View of a block of granite prepared for the second form of ap plication of my invention;

Fig. 5 is a sectional View 0 in Fig. 4; 7

Figs. 6 and 7 are plan views showing successive steps in carrying out the invention;

' Figs. 8 and 9 are sectional views, taken on the line 88 in Fig. 6 and 9-9 in Fig. 7 re- 11 the line 5-5 spectively, and

Fig. 10 is a partial plan view ofthefinished product. v

Referring to Figs. 1 to 3, I have shown my invention applied to the productionof an; ornamental surface on a block of granlte 3.,

In carrying out my invention, I first provide rated by narrow openings 22. Additional' openings'23 maybeforme'd in the bars21 as desired.) 3 l After the screen is applied to thesu'rface of. the stone, a sand blast is directedagainst the screen, which will have theeifect of reproducing the/openings 22and 23'in the orig inal ground surface of the'granite.

l/Vhen the screen.is removed,the granite will present the'eifect indicate'd'ain Fig. 3,

somewhat suggestingtapestry. The contrast of "the deeply. out lines with-the original ground tive.

flat' surface is pleasing andiverlyi efi'eccated in Figs..;.4c and 5, asuitabledesignis outlined ithereon, and the glue .within "saidv outlines s removed to exposerthesurfaceof thegraniteG.

A sand blast is then applied to .thesiirface of the "stone, cnttingl'the outline groove as indicated at 32 in Figs. 6 and 8 and giving the ornamental figure a contoured effect, as

indicated at 33 in Fig. 8. This contoured effect may be increased by the use of a small nozzle by which the surface may be more accurately shaped; I

I- then re-glue the surface of the granite G and remove the glue from the background between the ornamental figure and theoutline groove. I then place a screen over the granite block G thus prepared, as clearly indicated in Figs. 7 and 9.

I then direct the sand blast through the screen, reproducing the design of the screen in the portions of'the original surface between the ornamental figure and the outline groove. The screen and glue are thenremoved from the surface of the block, and the work presents the finished indicated in Fig. 10.

the screen may be widely varied as to deappe'arance "In both examples of the application of my improved method, it will be understood that sign. It will also be noted that all parts of the finished product in Figs. 1 to 3 are in the original plane of the groundsurface arm the block S. This is also true of the product indicated in Fig. 10, except that the ornamental design is sunk below the surface. In both cases, the screen effect is produced directly in the original prepared surface of the stone block. 7

Having thus described my invention and the advantages thereof, I do not Wish to be limited to the details herein disclosed otherwise than as set forth inthe claims, but what I claim is r 1. The method of producing an ornamental surface on a granite blockwhich consists in providing a smooth surface of pleasing texture on said block, forming and shaping a design therein, protecting the design by placing a coating thereon, placing a screen over said block and protected design, and sand blasting the unprotected surface around said design through said screen to reproduce the apertures in said screen in the originally prepared smooth surface of the granite block.

2. The-methodof producing anornamen tal surface ona-graniteblock Whichconsists in providingasmooth surface of aipleasing texture on said block, forming and shaping a-designtherein, placing a screen over said block of granite and sand-blasting the surface around said design throughsaid screen to reproduce the aperturesof said screen in the originally preparedsmooth surfaceof the granite block, and inseparately covering said design surface and said surface around the design each 'Wllill a protective coating While thesand blasting of the other surface is being performed. i

In testimony whereof I have hereunto affixed my signature.

7 ELROY A. CHASE. 

